DS2438K

The DS2438K Evaluation Kit makes performance evaluation, software development, and prototyping with the DS2438 Smart Battery Monitor easy. The evaluation board interfaces to an IBM-compatible PC through a DS9123 Serial Port Adapter and RJ-11 cable connection. Two floppy disks contain the DS2438K software, which can be run under Windows 95, Windows 98 or Windows NT.

Resistor R1 on the evaluation board DS2438K is a 50 m current sense resistor. Resistor R2 and capacitor C1 implement the VSENS low-pass filter recommended by the DS2438 data sheet. Component site R3, which is intentionally unpopulated, allows another sense resistor to be soldered down in parallel with or in place of resistor R1. Component site C3, intentionally unpopulated, allows a capacitor to be connected to the VAD input if needed.

The evaluation board DS2438K can be connected to a power supply and an external load in configurations that simulate either charging or discharging for the DS2438. Figure 1a below illustrates the charging configuration while Figure 1b shows the discharging configuration.